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In contrast to 7a, its tribenzo analogue can be observed at -60° C; see refs. [25, 29]
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Matrix isolation experiments have been performed in an argon matrix at 10 K with flash pyrolysis (600 and 750°C) and photolysis (254 and 313 nm) techniques. In all cases decomposition of the starting material 7d was observed but no sound evidence for the formation of acepentalene (3) was collected: R. Haag, H. P. Reisenauer, G. Maier, A. de Meijere, unpublished results.
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1H NMR of the hydrolysis products
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1H NMR of the hydrolysis products.
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